Question: For some painkillers, the size of the dose, D, given depends on the weight of the patient, W. Thus, D = f(W), where D is in milligrams and W is in pounds.
(a) Interpret the statements f(140) = 120 and f'(140) = 3 in terms of this painkiller.
(b) Use the information in the statements in part (a) to estimate f(145).